[kupfer] preferences: Use AboutDialog.get_content_area(..)

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 522fb81fa483690ebdbf6b6d2e7508b95bb041d7
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Mon Aug 31 14:01:52 2009 +0200

    preferences: Use AboutDialog.get_content_area(..)

 kupfer/preferences.py |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/kupfer/preferences.py b/kupfer/preferences.py
index d28e1a1..2294f19 100644
--- a/kupfer/preferences.py
+++ b/kupfer/preferences.py
@@ -223,11 +223,9 @@ class PreferencesWindowController (pretty.OutputMixin):
 		about.set_version(version)
 		about.set_comments(description)
 		about.set_copyright(author)
-		# extra info hack; find the vbox in the about dialog
-		child = about.get_child()
-		if isinstance(child, gtk.VBox):
-			wid = self._make_plugin_info_widget(plugin_id)
-			child.pack_start(wid)
+		child = about.get_content_area()
+		wid = self._make_plugin_info_widget(plugin_id)
+		child.pack_start(wid)
 
 		about.show()
 		about.connect("response", lambda widget, response: widget.destroy())